Liotdre jack



July 24, 1928. Re. 17,050

I l. E. DEARSLEY LIFTING JACK Original Filed Aug. l4.- 1924 2Sheets-Sheet l g? M Y 6 SZ. 2

July 24, 1928.

l. E. DEARSLEY LIFTING JACK Original Filed Aug. 14, 1924 2 Sheets-Sheet2 ITuQ 5 lii l I I I N N Egg f fill/1'22 ifleargzq mus Reissued July 24,1928.

UNITED STATES PATENT OFFICE.

rue comreuzor anemia, WISCONSIN,

A CORPORATION OF WISCONSIN.

mrrme .mcx.

original No. 1,533,168, dated April 14, 1925, Serial No. 732,041, filedAugust 14. 1924. Application for reissue filed February 1? 1926. SeriaINo.

This invention relates tmthe class of de vices known as lifting jacks,ticulerly to such a device designed to have an exceptionally long liftin proportion to its size end height when in lowered or collapsedposition.

While the uses for such a jack are innu Inerable, it is especiallyadapted for advantageous use'in the automotive industry with the newoversize or balloon tires. For this use it is desirable to have a jackwhich is compact and of small vertical height when lowered, in order tohe placed under the low axle or other frame part when the tireiscollepsed, and capable of a comparatively long lift to elevate the carabove its normal driving height in order that the tire may he changed.

The jack is of that type employing a plurality of screws working onewithin another and each contributing its share to the total lift of thejack. According to this invention the screws are telescoped or nested.within one another and within the'stanclerd of the jack when in loweredposition, and driving connections are provided whereby upon a continuousrotation of the driving means, which may he operated from a distence,tl1e screws are successively and individually elevoted one at a timewith respect to the memh ors in which they are threaded. Accordinp; tothe embodiment of the invention here shown by way of example, two nestedscrews are employed. the outer screw being an extcriorly threaded sleevewhich meshes within a nut fo med in the rotatable driving gear. Theinner screw meshes within a nut formed the upper end of the outer screwsleeve. Means are provided to hold the inner screw against rotation atall times but allow it to move vertically. The outer screw sleeve isheld against rotation, and lifted by the driving not to its fullelevation, carrying the inner screw with it hodily. When the sleevereaches the upper limit of its travel, it be.- comes locked. with thedriving nutend is allowed to rotate, and then acts as eunit with thedriving nut tolift the inner screw up through the sleeve.

The object of the invention includes, besides providing a. jackoperating as briefly noted above and as set forth inmore detailhereinafter, providing means for positively and more p arp eitherdirection; and providing a compact and sightlyljack, in which the partsare easily assembled and readily accessible.

Other objects and advantages of the inventiou. will be readily apparentfrom the following detailed description of one approved form of theapparatus. In the accompanying drawing:

Fig. 1 is a central vertical section throu h the jack, showing the samepartially e evoted position.

Fig. 2 is a central vertical at right angles to, Fig. in loweredposition.

Fig.3 is a. horizontal section taken stentielly on line 3-3 of Fig. 2.

Fig. 4. is a. perspective view of the locking sleeve or tube for theinner screw.

Fig. 5 is a. perspective view showing the lower lace of the drivinggear.

Fig. '6 is 2. detail sectional plan on line 6-6 of Fig. 2.

The stationary standard for the jack comprises a substantiallycylindrical hollow ecsting 1, having e broad supporting her: 2. At itsupper end the standard has on inner ennuler supporting ring. 3, and eflering housing & for enclosing the large driving gear hereinafterdescribed. A cover plate 5, detachehly connected with the member thyscrews completes the housing about the driving mechanism. Ace-litrecircular open ing 5" in the cover 5 ernnits the elevation tlierethroughof the lifting screws hereinafter described.

' The rotatable driving member 7, here shown as e comperetively largebeveled gem, is supported above the ring 3 of stand 2rd 1 by means of aninterposed hell been ing assembly 8 or other equivalent form ofanti-friction. supporting means. Since the driving gear '1 supports thelifting screws, which in turn support the load, the entire load willalways be transmitted to the steedard 1 through these anti-frictionhearings section, taken 1, showing the jack Sill):

8 and in this Way the lifting or driving strain will be reduced to aminimum. J ournaled in a housing extension 9 formed at one side of thestandard 1, is a short supporting ring 3, to act as a guiding andstrengthening member, and this sleeve is interiorly threaded to act as anut forlifting the outer screw. This outer screw is in the form of ahollow sleeve 14, exteriorly threaded to mesh with the nut 13 in-thedriving gear 7, and is ofsubstantially the same height as the totalheight of the standard.

Short pins or projections 15 extending from tical travel.

opposite sides of the lower end of sleeve 14, travel up and down invertically extending grooves or slots 16 in the standard 1 to hold thesleeve against rotation during its Ver- At their upper ends the slots 16open into an annular channel 17 formed in the standard 1 directly belowthe lower end of driving nut 13. The nut 13 is formed on its lower facewith a locking shoulder 18 with which one of the pins 15 is adapted tocooperate to lock the sleeve to the nut when the sleeve 14 has reachedthe upper limit of its travel.

The inner screw meshes with a nut 20 formed in the upper end of theouter screw sleeve 14. This inner screw is of substantiall the sameheight as the outer screw and t e standard, and

carries at its upper end a load supporting 7 cap 21 which-is mountedthereon by a universally rocking joint so that the cap 21 may adaptitself to the tilting load as the jack is elevated. Movably suspended inthe annular space screws, is acomparatively thin metallic tubular member23. At its lower end this tube is provided with outwardly extending lugs24 which travel up and down in slots .25 formed in the standard 1,parallel to and spaced ninety degrees from the slots 16 previous ydescribed. Removable spring actuated locking pins 26, projects into theslots 25 near the upper end thereof.

Tube 23 is provided with oppositely disposed vertical slots 27.extending nearly its entire length and in line with the lugs 24. Shortpins 28 are slidably mounted in-a diametrically disposed opening in thelower end 19, which is threaded in.- the same direction as the outerscrew 14,

22 between the inner and outer.

compression spring 29 inof screw 19, and a the inner ends of the twoterposed bet-ween pins 28 normally wardly. These pins 28 slide up anddown in the slots 27 in the tube 23.

tends to force them out-t It will noted/that thetube 23 is locked at alltimes 7 to the stationary standard 1 by means of the lugs 24, and thatin turn the inner screw 19 is locked to the tube 23 by means of pins 28operating in slots 27. B this means, although the screw 19 may eelevated bodily completely out of the standard 1, as shown in Fig. 1, itis at all times locked to the standard in such a manner that it cannotrotate. This tubular locking means for the inner screw is not claimedspecifically herein, but is claimed in the patent to Gunnar J ensen, No,1,538,896, granted May 26, 1925.

At the interior of its lower end, the outer screw sleeve 14 is providedwith'cammed locking shoulders 30 with which the spring thrust pins 28are adapted'to cooperate to lock the two screws together when the innerscrew is completely nested within'the outer screw. The cammed or slopingsurfaces 30 leading to the shoulders 30 extend circumferentially insidethe lower end of thescrew sleeve and are so inclined that the pins 28will readily ride out away from these shoulders and slide up the innersurface of sleeve 1i when the'parts are rotated in such a direction asto elevate the screws, but the pins 28 will lockagainst shoulders 30when the parts are so rotated as to lower the inner screw completelywithin the outer screw.

1 A plate 31 driven into the lower face of base plate 2 closes'theopening in the base of the standard after the parts have been assembled.Although the screw members may be removed through this bottom open ingby removing the base plug 31, they may also be taken out through theupper portion of the jack when the cover 5 is removed. 7

In operation, the jack, in collapsed or lowered position as shown inFig. 2, is inserted beneath the member to be elevated.

Ill)

The removable handle is then inserted inthe f the screw sleeve 14 whichcarries bodily with I K it the inner screw 19 and the load supportedWhen the sleeve 14 has reached ins 15 Will thereby. I the upper limit ofits travel, the

run out of slots 16 into the annu ar channel 1 17, allowing them torotate, and will simultaneously lock against the lower surface of nut13.

The driving gear 7 and sleeve 14-... will now rotate as a unit. Sincethe inner screw 19 is still held againstirotation by the tubular member23 as above described, the rotating nut 20 in the upper end of sleeve 14will now elevate the inner screw 19 and the load carried thereby, asindicated in Fig. 1. The upward travel of the parts is limited by theengagement of pins 28 with the upper ends of slots 27 and the engagementof the top of tube 23 against the bottom of nut 20. Before reaching theupper limit of their travel lugs 24 will pass the yielding lockinv pins26, which then snap out under the lugs. It will be noted that theextreme height of thejack when in extended position is between two andthree times its height when in collapsed position.

When the jack is to be lowered the handleis rotated continuously intheopposite direction. The screw sleeve 14 will still be locked to thelower surface of driving member 7 and will rotate therewith, and theinner screw 19 will first be lowered until it is completely nestedwithin the outer screw 14. During this first lowering operation, tube 23.will be held elevated within screw sleeve 14, by the yieldable pins 26which are now extended below the lower end of the tube. When the innerscrew 19 reaches the lower limit of its travel within the outer screw,the pins 28 in the lower end of screw 19 will engage with lockingshoulders 30 in the lower end of sleeve 14 and prevent further rotationof this sleeve, the pins 15 being at this time directly over the slots1.6. By" holding tube 23 elevated until this time, so-

that pins'28 are at the lower ends of slots 27, adjacent the lugs 24 onthe tube, the twisting strain on tube 23 when sleeve 14 is locked, istaken by; the stronger'lower end of the tube, and the possibility oftwisting the tube is avoided. The sleeve 14 will now be screwed downthrough the continuously rotating driving member 7, the pins 15' on thesleeve sliding down into-and through the slots 16 in the standard. Alsolugs 24 will be pushed down past spring pins 26 and the tube 23 willslide down to its lowered position.

It will be noted that the load supporting.

parts of this jack are comparatively simple, and may be made strong andrugged to support a considerable load. The great gear:- reduction, dueto the reducing bevelled gears 11 and 7 and the screws which operatesingly, enable one to elevate a great load with little effort. thisbeing'further reduced by the anti-friction supporting bearings for thelifting and drivingmembers. The jack, when lowered, is compact and maybe stored in a small space, and presents a very sightly appearance,there being no projecting parts except the cap 21 and the socket member12.

Obviously other forms of rotary driving means than the beveled gearshere shown may be used, and the prpportions and details of the severalparts may be varied without departing from the scope of the invention asset forth in'the following claims.

I claim: j f

1. A lifting jaclt' comprising a hollow -standard, a rotatable drivingmounted in the upper portion of the standard, a pair of nested screwsmounted in the standard and drivifijig member, and separate connectionsbetween the'standard and each screw, whereby when the driving member iscontinuously rotated the outer screw will first be positively elevatedto its full height, carrying the inner screw bodily with it, and thenthe inner screw will be elevated with relation to the outer screw.

. 2. A lifting jack comprising a hollow standard, a rotatable drivinmember mounted inthe upperportion oi the standard, a pair of nestedscrews mounted in the standard and driving member, and separateconnections between the standard and each screw, whereby when thedriving member is continuously rotated the outer screw will l 90a,rotatable interiorly threaded driving mem-, ber mounted in thestandard, an exteriorly threaded sleeve meshing within the drivingmember and having an interiorly threaded nut formed in its upper end, ascrew meshing in the nut, means to prevent rotation of the screw butallow itto move vertically, means cooperating with the standard forpreventing rotation of the sleeve'until it reaches the upper limit ofits travel and then locking the sleeve to the driving member to turn.therewith, and a yieldable lock ing member on the lower portion of thescrew cooperating with a shoulder in. the lower end of the sleeve whenthe screw and the sleeve are telescoped and the driving member is beingrotated to lower the jack.

4.111 a lifting jack, the combination of a standard, a driVing'nutinsaidstandard, a sleeve having an exterior thread meshed with the thread ofthe nut and an interior member v 3. A lifting jack comprising astandard,

the sleeve and standard which. compel the sleeve to move upwardlywhenthe driving nut is rotated forwardly and which are dis engaged whenthe sleeve reaches the upper end of its travel to allow the sleeve torotate with the nut on continued forward rotation of the latter, toraise the inner screw, and

means efi'ectiv'e when the driving nut is given reverse rotation, tostop the rotation of the sleeve with its guiding device above and inoperative alignment with the guiding to bring about upward and downwardmove-- ments of the sleeve and above which the projection is raised whenthe sleeve is at the upper limit of its travel, and a stop associatedwith said non-rotating structure comprising a spring pressed retractivemember to engage the sleeve and prevent rotation thereof in onedirection only, whlch, when the nut is rotated in the direction to lowerceive said pin and with a space above the guide slot in which the pin mamove circularly, with,cont inued rotation of the driv ing nut in theforward direction, and means effective on the reverse rotation of thedriw ing nut for stopping the rotation of the sleeve with the pindirectly over said guide .slot.

6. In a lifting jack, the combination of a standard, a driving nut insaid standard, a sleeve having an exterior thread meshed with the threadof the nut and an interior thread, an inner screw exteriorly threadedfor engagement with the interior thread of the sleeve, cooperatingguiding and stop means comprising a spring pressed retractable memberwhich means is eliecti-ve when the nut is rotated in the forwarddirection to first compel the sleeve to move upwardly and then'permitthesleeve to rotate with the nut to raise the inner screw and, when therotation of the nut is reversed, to stop the rotation of the sleeve withthe nut and compel the sleeve to-move downwardly.

7. In a lifting jack the combination of a non-rotating supportingstructure, a driving nut thereon, a sleeve exterioi'ly threaded forengagement with said nut, formed with an interior thread and providedwith a projecting member, a llfting screw exteriorly threaded forengagement with said sleeve, a

vertical guide on said supporting structure against which saidprojection bears to bring about upward and downward movements 01' thesleeve and above which the projection is raised when the sleeve is atthe upper limit of its travel, anda stop associated with saidnon-rotating structure which engages said sleeve, when the nut isrotated in the direction to lower said sleeve and arrests rotation ofsaid sleeve at a point to position said projecting member in verticalalignment with said guide. v

8. In a lifting jack the combination of a non-rotating supportingstructure, a driving nut thereon, a sleeve ,exteriorly threaded forengagement with said nut, formed with an interior-thread and providedwith ciated the sleeve stops the rotation thereof at a point whichpositions said projecting mom her in vertical alignment with said guideon the non-rotating structure.

9. In a lifting-jack the combination of a non-rotating supportingstructure formed with a vertical guide slot which extends only part wayto the top of said structure, a driving nut on said structure, a sleeveexteriorly threaded for engagement with said nut formed with an interiorthread, and provided with a projecting member to ex tend into said guideslot, and a stop assowith which engages said sleeve when the nut isuotated in the direct-ion to lower the sleeve and arrests rotation ofthe sleeve ata point to position said projecting member vertically a ovethe upper end of said guideslot.

10. In a jack, the combination of a nonrotating structure formed with alongitudinal guide, a driving nut, an outer hollow screw meshed with thenut and internallv rotate to elevate the inner'screw, and when thedriving nut is given a reverse rotation lowers'sald screws insuccession.

11. In a jack, the combination of a non-' rotating structure formed witha longitudlnal guide, a driving nut, an outer hollow screw meshed withthe nut and internallv threaded, an inner screw meshed with the internalscrew of the outer screw and means comprising a spring pressed pincooperating with said guide and earns which permit the pin to rotate inone direction but prevent its rotation in the other, which means whenthe nut is rotated in one direction forces the outer screw to'inovewithout turning to its maximum elevation and then to rotate to elevatethe inner screw, and when the driving nut is given a reverse rotationlowers said screws in succession.

12. In a lifting jack the combination of a standard, a driving nutrevoluble supported thereon, means for rotating said nut, an exsaidnonrotating structure I teriorly threaded sleeve, engaged by said nutand having an interior thread, a l fting screw exterior-1y threaded toengage the nterior thread of the sleeve, and mechanism made effective,independently of the load on the jack, to give non-rotary movements,outwardly with respect to the standard, first to the sleeve and screwtogether and then to the screw alone, when the driving nut is rotated inone direction and, when the nutis rotated in the other direction to givenonrotary movements, inwardly with respect to the standard, first to thescrew alone and then tothe sleeve and screw together.

13. In a lifting jack the combination of a hollow standard, a drivingnut revolubl'y mounted on said standard, an exteriorly threaded sleeveextending through said nut aridformed with an internal thread at itsupper end, a lifting screw exteriorly thread-v ed to engage the internalthread of the sleeve, a tubular member in said sleeve surrounding saidscrew, guiding means on the tubular'member and standard to preventrotation while permitting vertical movements of the tubular member,guidingmeans on the sleeve and standard, preventing rotary movements ofthe sleeve, exce t at the upper-' most position of the sleeve, W nlepermitting vertical movements of the sleeve, and guiding means on saidscrew and tubular member which restrains the screw from rotary movementwhile permitting vertical movements thereof.

14. In a lifting jack the combination of a hollow standard, a drivingnut revolubly mounted on said standard, an exteriorly threaded sleeveextending through said nut and formed with an internal thread at itsupper end, a lifting screw exteriorly threaded to engage the internalthread of the sleeve, a tubular ember in said sleeve sur rounding saidso w guiding means on the tubular member an standard to prevent rotationwhile permitting vertical movements of the tubular member, guiding meanson the sleeve and standard, preventing rotary movements of the sleeve,except at the upper-most position of the sleeve, while permittingvertical movements of the sleeve,

guiding means on said screw and tubular member which restrains the screwfrom rotary movement while permitting vertical movements thereof andmeans at the lower end of said'sleeve operative when the screw "is inits inner position in the sleeve to stop rotation of the sleeve in onedirection while permitting rotation in the other direction.

15. In a lifting jack the combination of a hollow standard, a drivingnut revolubly mounted on said standard, an exteriorly threaded sleeveextending through said nut and formed with an internal thread-at itsupper end, a lifting screw exteriorly threaded to engage the internalthread of the sleeve, a tubular member in said sleeve surrounding saidscrew and formed with lonupper-most position of the sleeve, whilepermitting vertical movements of the sleeve, spring pressed pins in thelower end of the screw to extend through the slots in the tubular memberand stop and cam faces on the inner surface of the sleeve at its lowerend adapted to be engaged by said pins.

16. In a lifting jack the combination of a *hollow standard, a drivingnut revolubly mounted on said standard, an externally threaded sleeveextending through said nut and engaging the thread thereof and providedat its upper end with an internal thread, a lifting screw externallythreaded to engage the internal thread of the screw, a tubular member inthe sleeve surrounding the screw, means on said tubular member andstandard for preventing rotation while permitting vertical movements. ofthe tubular member and means preventing rotation while permittingvertical movements of the screw with respect to the tubular member,-

and limiting rotation of the sleeve in one direction, when the screw isin its inner position in the sleeve, while permitting rotation of thesleeve in the other direction.

17. In a lifting jack the combination of a hollow standard, a drivingnut revolubly mounted on said standard, an externally threaded sleeveextendin through said nut -and engaging the thread thereof and providedat its upper end with an internal thread, a. lifting screw externallythreaded to engage the internal thread of the screw, a tubular member inthe sleeve surrounding the screw formed with a guide. slot, .a springpressed pin in the lower end of the screw to extend through said slotand stop and cam faces on the inner surface of the sleeve at its lowerend adapted to be engaged by said pin. 1

18. A lifting jack comprising a standard, an outer screw interiorly andexteriorly threaded, an-inner screw in mesh with the interior threadofthe outer screw, a driving nut on' the standard held from lengthwisemovement with respect thereto and engaging the exterior thread of theouter screw, means for rotating the driving nut, means for restrainingthe inner screw from rotation throughout its range of movement and meanscooperating with the outer screw for compelling the screws to be raisedor lowcred, one after the other, each to the full ex- I tent of itsvertical movement regardless of the load on the jaclr,

19. A. lifting jack comprising a standard,

anouter screw. arranged for vertical movement in thestandard and havinginterior meshed with said gear teeth on the hatfor 1 rotating the nut ineither direction and mechanism for controlling the movements of saidscrews comprising an element vertically movable in. the standard havingpositive sliding and non-rotative connections wit 15 the standard andthe inner screw.

IRWIN E. DEAR SLEY.

